Growatt SPF 5000 ES Error Codes: Troubleshooting and Fixes

Growatt SPF ES series inverters are multifunctional off-grid solar inverters designed for backup power and self-consumption applications. When your Growatt SPF 5000 ES or SPF 3500 ES inverter displays an error or warning code, it indicates a specific operational issue that requires attention. Understanding these codes is crucial for maintaining system stability and preventing potential damage.

This guide provides a comprehensive diagnostic table for Growatt SPF ES inverters, differentiating between warning codes (which allow the unit to continue running) and fault codes (which typically shut down the inverter's output). We'll detail common issues like low battery voltage, high bus voltage, overcurrent, and low output voltage, along with instructions for setting up lithium battery communication.

Understanding Growatt SPF ES Error and Warning Codes

Growatt SPF ES inverters use a system of codes to communicate operational status and issues. These are broadly categorized into:

• Warning Codes: These indicate conditions that require attention but do not immediately shut down the inverter's output. The unit may continue to operate, but performance could be affected or a fault condition might be imminent.
• Fault Codes (Errors): These signify critical issues that cause the inverter to stop its output to protect itself or connected equipment. Addressing fault codes is essential to restore normal operation.

The inverter's display will show these codes, often accompanied by specific beeping patterns for warnings.

Detailed Troubleshooting for Common Growatt SPF ES Errors

Here's how to address some of the most frequently encountered fault and warning codes on your Growatt SPF ES inverter:

Error 04: Battery Voltage is Too Low

Meaning: This is a warning code indicating that the battery voltage or State of Charge (SOC) is too low. The inverter detects that the battery bank is discharged below acceptable levels.

Fix Direction:

1. Measure Battery Voltage: Use a multimeter to measure the battery voltage at the DC input terminals of the inverter.
2. Check Lithium Battery SOC: If using a lithium battery, check its SOC directly on the inverter's LCD display.
3. Recharge the Battery: Ensure the battery bank is being recharged by solar or AC input. Verify that charging sources are active and correctly configured.

Error 08: Bus Voltage is Too High

Meaning: This fault code indicates that the internal DC bus voltage within the inverter has exceeded its safe operating limit.

Fix Direction:

1. Check Lithium Battery Settings (without communication): If you are using a lithium battery without BMS communication, verify the voltage settings in Program 19 (C.V. charging voltage) and Program 21 (Low DC cut-off voltage). These values might be set too high for your specific lithium battery, leading to an overvoltage condition.
2. Restart the Unit: Power down the inverter completely, wait a few minutes, and then restart it. If the error persists, contact a qualified service center.

Error 51: Over Current or Surge

Meaning: This fault code signifies that the inverter has detected an excessive current draw or a sudden power surge on its output. This often happens when connected loads exceed the inverter's capacity or during startup of inductive loads.

Fix Direction:

1. Restart the Unit: Power cycle the inverter.
2. Reduce Connected Load: If the error reoccurs, reduce the total load connected to the inverter by switching off some equipment.
3. Contact Service Center: If the error persists after reducing the load and restarting, there may be an internal component failure, and the unit should be returned to a repair center.

Error 58: Output Voltage is Too Low

Meaning: This fault code indicates that the inverter's AC output voltage is lower than 80Vac. This can be caused by excessive load or an internal issue. This code is grouped with Fault code 06, which indicates output voltage too high (above 280Vac).

Fix Direction:

1. Reduce Connected Load: Disconnect non-essential loads to see if the output voltage returns to normal.
2. Restart the Unit: Power down and restart the inverter.
3. Contact Service Center: If the error persists, the unit may require repair.

Comprehensive Growatt SPF ES Diagnostic Table

The following table lists all known error and warning codes for the Growatt SPF ES series inverters, along with their meanings and recommended fix directions.

BMS Lithium Communication Setup

For optimal performance and safety with lithium batteries, it is highly recommended to establish communication between your Growatt SPF ES inverter and the battery's Battery Management System (BMS).

1. Select Battery Type

Navigate to Program 05: Battery type on your inverter's LCD panel.

• Select LI if your lithium battery supports BMS communication. This option is "only suitable when communicated with BMS".
• If your lithium battery does not have BMS communication, select User-Defined 2. This allows you to manually set charge and low DC cut-off voltages in Programs 19, 20, and 21. For User-Defined 2, it is "recommended to set to the same voltage in program 19 and 20 (full charging voltage point of lithium battery). The inverter will stop charging when the battery voltage reaches this setting."

2. Configure Communication Protocol

If you selected "LI" in Program 05, you need to configure the communication protocol in Program 36: Communication protocol.

• Choose an RS485 Protocol (Protocol 1-50) or CAN Protocol (Protocol 51-99) that matches your battery's BMS.

3. Connect BMS Communication Cable

The Growatt SPF ES inverter features a dedicated BMS communication port that supports both CAN and RS485 protocols. Ensure your communication cable is correctly wired according to the pin assignment:

4. Set Low DC Cut-off SOC (for "LI" mode)

When "LI" is selected in Program 05, you can set the Low DC cut-off SOC in Program 21. The default is 20%, and it is settable from 5% to 50%.

Safety Precautions

Working with solar inverters and battery systems involves significant electrical hazards. Always prioritize safety.

• Qualified Personnel: All wiring and maintenance must be performed by a qualified person.
• Disconnect Power: To reduce the risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning off the unit alone will not eliminate this risk.
• Battery Safety:
• • Charge only deep-cycle lead-acid type rechargeable batteries and lithium batteries. Other types may burst.
  • NEVER charge a frozen battery.
  • Be very cautious when working with metal tools on or around batteries to avoid sparks or short circuits. A short circuit across a battery bank can cause an explosion.
• Grounding: This inverter must be connected to a permanent grounded wiring system. Comply with local requirements and regulations.
• Circuit Protection:
• • Install a separate AC breaker between the inverter and the AC input power source. The recommended specification is 40A for the SPF 3500 ES and 50A for the SPF 5000 ES.
  • Install a separate DC circuit breaker between the inverter and the PV modules.
• Avoid Short Circuits: NEVER cause AC output and DC input short circuited. Do NOT connect to the mains when DC input short circuits.
• Parallel Operation: If using multiple inverters in parallel, do not connect the current sharing cable between inverters that are in different phases, as this may damage the inverters. Ensure all inverters share the same battery bank; otherwise, they will enter fault mode.

By following these troubleshooting steps and safety guidelines, you can effectively diagnose and resolve common issues with your Growatt SPF ES inverter, ensuring reliable operation of your off-grid solar system.